SITE INFORMATION AND CORRESPONDENCE

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.f \� Case Closure Summary Page 2 Leaking Underground Fuel Storage Tank Program III Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations --Before and After Cleanup Contaminant Soil (ppm) Water [ppm) Contaminant t34 (ppm) 7NANA Before After Before After After TPH(Gas) 260 <1.0 11 x0.050 Ethylbenene <0.005 TPH (Diesel) NA NA NA NA Xylene <0.01 Benzene 6.8 <0.005 0.61 <0.0005 MTBE NA Toluene 21.0 <0.005 0.25 <0.0005 Comments: Soil Before results are from soil boring P2 collected on 02/02/98 at 20 feet, except total xylene soil results are from P2 at 10 feet. Soil After results are from borehole SBF at 35 and 45 feet collected on 03103105. Water Before results are from soil boring P5-W collected at 50 feet on 03106198. Water After results are from MW-1 collected on 03/30107. IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes? Yes Monitoring/Vapor wells decommissioned. No Number Decommissioned: 0 Number retained: 3 List enforcement actions taken: NOR 04/07/98 List enforcement actions rescinded: None V. Local Agency Representative Data Name: Margaret Lagorio Title: Program Coordinator Unit IV Signature: Date: -4,1416-7 VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: James L.L. BartonResponse: Title:Associate Engineering Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.